what is code p-1870 no dtc?
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2002 Isuzu Trooper Question: check engine
Answer #1overbys from Overbys Inc, May 19, 2011, 07:44Master
this is a transmission fault; here's some info:
Range switch malfunction could set a DTC P1870.
A mechanical failure of the shift solenoids, TCC solenoid, or TCC PWM solenoid could set a DTC P1870.
Internal transmission failures may set a DTC P1870.
An intermittent or incorrect engine speed signal may set a DTC P1870.
there are several tests a shop can run to identify the cause. definitely not a DIY repair.